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KMID : 0613820220320110908
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Journal of Life Science
2022 Volume.32 No. 11 p.908 ~ p.917
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Systemic Acquired Resistance in Plants
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Jeon Da-Won
Kim Tae-Kyung
Lim Gah-Hyun
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Abstract
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Systemic acquired resistance (SAR) is a form of systemic immunity that prevents secondary infections
of distal uninfected parts of plants by related or unrelated pathogens. SAR is mediated by several SAR-inducing chemicals or mobile signals that accumulate after pathogen infection. Several chemicals that move systemically have already been identified as SAR-inducing factors, despite the fact that the early mobile signal remains unclear. These chemicals can be transported into either the apoplastic or symplastic compartments. Many of the chemicals associated with SAR remain unknown in terms of their transport routes. There is recent evidence that azelaic acid (AzA) and glycerol-3-phosphate
(G3P) are transported via plasmodesmata (PD) channels, which regulate the symplastic route. In contrast, salicylic acid (SA) is preferentially transported from pathogen-infected to uninfected parts via the apoplast. The pH gradient and SA deprotonation lead to apoplastic accumulation of SA before it accumulates in the cytosol. Moreover, there is evidence that the mobility of SA over a long distance is crucial for SAR and that the partitioning of SA into the symplast and cuticles is controlled by transpiration. Further research has shown that a portion of the total SA in leaves is partitioned into
cuticular waxes. The purpose of this review is to discuss the role of SAR-inducing chemicals and the regulation of transport in SAR.
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KEYWORD
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Glycerol-3-phosphate, pipecolic acid, SA transport, salicylic acid, systemic acquired resistance
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